GREENWICH, Conn. – Three teenagers were arrested on drug charges after being observed by school security guards in separate incidents on the Greenwich High School campus, according to Greenwich police.

The three were not identified since they all were under 18.

A 16-year-old male was observed on school surveillance cameras making a drug transaction. He was searched, per school policy, and allegedly found with .03 grams of marijuana on his person. He was reportedly identified as the seller of the marijuana by another student.

He was charged with possession of marijuana of less than half-an-ounce and intent to sell. He was issued a juvenile summons with a court date of Jan. 22.

A 17-year-old male, was allegedly found in possession of .07 grams of marijuana.

He was charged with possession of marijuana of less than half-an-ounce. He was issued a juvenile summons with a court date of Jan. 22.

A 16-year-old female was observed by Greenwich High security guards on the school's surveillance system smoking what was believed to be marijuana on school grounds.

Security guards brought the suspect to the office of the Dean of Students, where her backpack was searched, per school school policy. The guards found 4.2 grams of marijuana in her backpack.

She was charged with possession of marijuana of less than half-an-ounce. She was issued a juvenile summons with a court date of Jan. 22.

In other police news:

Vincent Young, 47, of the Bronx, N.Y., was arrested and accused of attempting to obtain Oxycodone with a fraudulent prescription at the Walgreens on East Putnam Avenue, according to Greenwich police.

He was charged with second-degree forgery, criminal attempt at obtaining a controlled substance and criminal attempt at obtaining a controlled substance by forgery.

Young was held at the Greenwich Police Department on a $2,500 bond and is scheduled to appear in Stamford Superior Court on Jan. 28.